Knowing too much about photography infects everything from watching tall, handsome Keith Carradine play E. J. Bellocq in Louis Malle’s 1978 film “Pretty Baby” (while remembering that Bellocq was a hydrocephalic dwarf) to reading John Berger’s typically eloquent paean to Pentti Sammallahti’s mystical relationship to the dogs in his photographs (while knowing that this Finnish photographer uses sardine oil to attract them into his camera’s field of vision and hold them there). […]